Method of making evaporators



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Panarea od. ze, 1930 4 UNITED STATES THGIMIAS J'. LITIE, JR., 0F INDIANAPOLIS, INDIANA., ASSIGNOR T0 COPLAND 'PROD-- PATENT OFFICE Uc'rs, nrc., or nn'rnorr, MICHIGAN, A CORPORATION or MICHIGAN nnrr'ron or MAKING Evnromi'rons R S S U application led Hay 8, 1926, Serial No. 107,568. Divided andthis application med April 10, 1929.. Serial No. 353,911.'

My invention relates to improvements in refrigerating1 apparatus, and more articularly to the eat absorbing unit of t e compressor type of refrigerating machine which is enerically termed the expansion chamber, and is a division of my application for Letters Patent of the United States for improvements in refrigerating apparatusiiled May 8, 1926, Serial Number 107,568.

It is the primary object of my invention to provide a heat absorbing unit of a simple and cheap construction, together with a simple and cheap method of constructing the same.

With these and other objects in view, my invention consists in the arrangement, combination and construction of the various parts of m improved device as described in the speci cation, claimed in my claims and shown in the accompanying drawings, in which:

Fig. 1 is a plan view of the metal sheet which forms the base of my device.

Fig. 2 is a cross section taken on the line 2 2 ofrig. 1. i

Fig. 3 is a plan view showing the second metal sheet imposed over the surface of the metal sheet which forms the base of my device, and also showing the line of weld by I which the two sheets are attached.

Fig. 4 is a cross section taken on line 44 of Fig. 3.

Fig. 5 is a plan view showing the second sheet imposed over the base sheet and also showing the -location of spot welds by which the two sheets are, at various points within their edges, secured together.

Fig. 6 is a cross section taken on line 6 6 of Fig. 5.

Fig. 7 is a plan view showing the means by which pressure is applied to expand the unattached inner surfaces of the sheets forming nay device.

Fig. 6 is a cross section taken on line 8-8 'of Fig. 7.

3 is a vertical cross section of a refrigcrater cabinet showing my device installed.

in Fig. 1 I have shown a square sheet of metal 1, with circular openings 2 and 3 stamped therein adjacent the edges of two sides of the sheet, said openings 2 and 3 being formed with circular lips 4 and 5 extending outwardly at right angles to the surface of the sheet 1 as shown in Fig. 2 rand said lips 4 and 5 being internally threaded to receive pipes or other threaded fittings.

Metal sheet 6 is then imposed upon that side of sheet 1 which doesnot carry the eX- tended lips 4 and 5. The edges of said sheet 6 are then welded to the edges of sheet 1 along the lines 7 as shown in Fig. 3. The inner and adjacent surfaces of sheets 1 and 6 are then secured to each other at spaced intervals by a plurality of spot welds 8 as shown in Fig. 5. A screw plug 9 isthen inserted in lip 4, thereby closing opening 2, and a-pipe 10 is then inserted in lip 5 and secured therein by fitting 11, thereby closing opening 3 as shown in Figs. 7 and 8. Air, or other like pressure is then applied through pipe 10 to expand and bend away from each other between the spot welds, the unattached inner surfaces of sheets 1 and 6, thereby producing a suflicient space between the'inner surfaces of sheets l and 6 to permit the circulation of liquid or gas refrigerant between the surfaces ofthe sheets l and 6, and to cause such circulation to be along a devious path. The device formed, as described, by sheets 1 and 6 may then be bent as indicated in Fig. 9, (it being 'understood, however, that the bending may occur prior to welding and expanding) ,so that the lips 4 and 5 may be connected with pipes 12 and 13 extended from the heat dissipating mechanism of a refrigerating machine (not shown) through the cabinet 14. -The sheets 1 and 6 thus bent and connected with the pipes l13 and 14 as shown in Fig. 9, form a basketlike, or substantially U-shaped container in which may be placed ice trays l'and 16. This basket-like container so formed and described may be'supported in the cabinet 14 by a perforatedA metal. or wire mesh partition 17, which is attached to the inner side walls of cabinet 14 as shown in Fig. 9.

It is evident that the above described heat absorbing mechanism may be much more cheaply and easily constructed than the exf additional advantage of providing a container in which may be placed the various articles usually desired to be frozen; The device when in operation has a much quicker freezing action upon articles placed within it, than the expansion coils, expansion chambers and brine tanks now commonly used, because it provides for the articles to be frozen, a greater area of contact with the heat absorbing surface than is provided by the other construction mentioned, and reduces to a minimum the number of conductors through which 'the heat must pass before being absorbed. f t

It is obvious that various changes may be made in the arrangement, combination and construction of my improved device without departing from e spirit of my invention, and it is my intention to cover by my claims such changes as may be reasonably included within the scope thereof.

What I claim is:

1. The method of making a refrigerating expansion chamber which comprises superposing two sheets of metal, one of said sheets being provided with a fitting opening therein, sealing the edges of. the sheets, welding the faces thereof at separated intervals and applying high pressure between the faces through said opening to separate them between the welds.

2. The method of making a refrigerating expansion chamber which consists in stamping fitting connections in a sheet of metal to which inlet and outlet fittings may be secured, placing another sheet of metal of the same size face to face with the first sheet, sealing the edges of the two sheets, welding the faces of the sheets together at separated intervals, closing one of said fitting openings andintroducing a relatively high pressure between the sheets through the other fitting openings to force the sheets apart between the separated welds.

3. The method of making a refrigerant chamber which comprises superposingtwo substantially flat sheets of metal, one of which is provided with a fitting opening therein, sealing the edges of said sheets together, securing said sheets together against separation at a plurality of points between their edges, and then separating said sheets at all points i except said edges and' said plurality of points by the introduction of fluid under pressure between said plates through said opening.

4. The method of making a refrigerant chamber which comprises superposing two substantall flat sheets of-metal, one of said sheets eing provided with an opening therein, sealing the edges of said sheets together, securing s'aid -sheets together against separation at a plurality of points between their edges, separating said sheets at all points except said edges and said plurality of points by the introduction of fluid under opening, and then bending said sheets to a predetermined form.

5. The method of making a refrigerant chamber which comprises superposing two substantially flat sheets of metal, one of said sheets being provided with an opening therein, sealing the edges of said sheets together, securing said sheets together a ainst separation ata plurality of points etween their edges, se arating said sheets at all points except sa1d edges and said plurality of points by t e introduction of fluid under pressure between said lates through said opening, and then ben ng said sheets to a substantially `U-shape. THOMAS J. LITLE, JR.

pressure between said plates through said l 

